Add WindowsPerformanceCounterFeed

Allows multiple Windows performance counters to be fed into Brooklyn sensors.
Updated CumulusRDF webapp resources with hotfix for proxy mode
Update CumulusRDF to use CassandraFabric
Tidy up Cassandra fabric and cluster interfaces
Removed spurious reference to byon
Fixed tearDown issue with already-released machine
Merge pull request #984 from Nakomis/fix-single-machine-location

Fix single machine location
Merge pull request #982 from jdtoy/template-release-notes

Release notes for SNAPSHOT.
Merge pull request #968 from richardcloudsoft/windows-perf-counter-feed

Add WindowsPerformanceCounterFeed
added new apache cassandra version 1.2.11 as suggested version
Merge pull request #985 from ZaidM/cassandra-node-version-update-2

updated apache cassandra version to 1.2.11
Initial MariaDB entity, largely a clone of the existing mySQL entity.
Merge pull request #986 from alasdairhodge/mariadb

Initial MariaDB entity
bump to jclouds 1.6.2
synch when assigning ports on SSH machines, to prevent race/conflicts
tidy, and allow Map.copyOf(null) to return an empty map (which i think is the common use case)
include both createNode impls in the call path in case either is overridden
remove no-longer-needed special case for jclouds google compute
Removed duplicate BROOKLYN_CLASSPATH export, and added new line char to prevent (visual) truncation of locations
Change ResourceUtils to use static create method and cache in driver classes